D China Chemical Engineering Eleventh Construction Company Metrology Section Kong Xiangmiao spring tube pressure gauge in use, due to vibration, wear, dust, oil and other reasons caused by loosening of the internal fastening screws, position changes, hairspring scattered, The wear and tear of the gears make us often encounter the indication of the tapping displacement overshoot during the verification process. The indication tapping displacement can be generally divided into several types: before, after, and after (or before and after), before, after, and after (or before and after), there are no intermediate ends (or no ends at both ends). Now introduce the repair method as follows: 1. Adjust the straight before the displacement (or before the rear). When the pressure gauge is large with the pressure value, the tapping displacement is changed from small to large or from When not, take the pin and dial, and gently pull a spring tube to determine whether the hairspring is loose or tight when the pressure is raised. If it is tightened, the tension of the hairspring is too large. At this time, the fixing screw of the upper plate can be opened. The hairspring is slightly relaxed to reduce the hairspring tension, so that the indication tapping displacement becomes smaller or disappears; on the contrary, if the hairspring is relaxed when the pressure is raised, the hairspring is too loose, and the hairspring is slightly tightened to the tension of the large hairspring. , can reduce or eliminate the indication tapping displacement.
2 indicates that the adjustment before tapping the displacement is large (or not before). This is the opposite of the above situation. The elasticity of the balance spring can be adjusted in the opposite direction in the same way as above to reduce or eliminate the indication. The value taps the displacement.
3. The value of the tapping is not in the middle of the displacement (or there is no middle of the two ends) or there is a correction at a certain point. There is no regularity, and the cause may be a whirlwind (or adhesion) movement. There are dust, oil stains, gear wear, etc., which can be adjusted by smoothing the hairspring, using a small soft brush and some gasoline to gently remove the oil in the movement and the hairspring, so that the hairspring does not stick or replace parts.
Through the above adjustment methods, the indication tapping displacement can generally be reduced or eliminated, thereby ensuring the quality of the spring tube pressure gauge verification work. Rapid adjustment of the metering optical meter workbench â–¡ Inner Mongolia Huolinhe Coal Industry Group Machine Repair General Factory Zhu Guoxue Vertical Optical Meter is a relatively accurate comparative measuring instrument commonly used in industrial enterprise measurement rooms. Due to the frequent use, the table needs to be inspected and corrected frequently, the purpose of which is to keep the plane of the table parallel to the plane of the measuring cap to ensure the accuracy of its measurement. However, in the worktable calibration, there is a phenomenon that the workbench is difficult to adjust.
Generally, the conventional calibration method is to use the same size block of the 1 mm area of ​​the 8 mm plane measuring cap, and repeatedly adjust the four adjustment screws at four different positions of front, back, left and right to make the reticle line The value of the change is less than 0.3, um is suitable. This conventional adjustment method is time consuming, especially for operators with less experience.
In the adjustment process of the vertical optical meter workbench for many years, the author explored a quick adjustment method, which is described as follows: Loosen the four adjustment screws on the workbench to make it free. Place the four equal weight blocks of (5~7) nm in the center of the table.
Loosen the boom fastening screw and slowly lower the boom so that the ☆8mm flat measuring cap is in contact with the center of the gauge block (the tightness is moderate), then tighten the boom.
In the horizontal and vertical positions, the gauge block is repeatedly moved, and the turning points in the horizontal and vertical directions are respectively searched from the eyepiece or the projection screen (note: the former without the projection device, and the latter with the projection device). When it is found that the readings of the two turning points are the smallest, the four adjusting screws are rotated to a state of tightness and non-tightness (the thread has a rotational force).
4 area re-contact the four different positions of the front and rear, left and right, and adjust the two pairs of adjustment screws in the horizontal and vertical directions respectively, so that any two position errors are not more than 03m. The accuracy of the calibration table is high, and the error can reach 0Vm, which can get twice the result with half the effort. Technology report China measurement
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